Re: [I] arm64: klauspost/compress v1.19.0/v1.19.1 corrupt the saved link register during zstd decompression [arrow-go]

["lizthegrey (via GitHub)" <gi...@apache.org>]

lizthegrey commented on issue #1016:
URL: https://github.com/apache/arrow-go/issues/1016#issuecomment-5123782374

   Closing this heads-up — follow-up analysis showed the crash scenario cannot occur on any current Go runtime, so my original severity claim was overstated. Verified against the shipped binaries and go1.26.5 runtime source: (1) the affected functions are leaves whose epilogue never reloads LR from the stack, so normal execution never reads the clobbered slot; (2) the Go runtime never async-preempts assembly functions, so GC stack scanning, `runtime.Stack`, and goroutine profiles can never observe these frames; (3) the only readers — SIGPROF tracebacks and frame-pointer unwinds — fail soft, truncating the sample rather than throwing. Actual impact: corrupted CPU-profile samples and broken debugger/core-dump backtraces through the zstd decode frames on arm64. No crashes, no data corruption, Parquet/IPC decode output is always correct. The upstream fix (klauspost/compress#1176, description now revised) will flow to arrow-go via a routine dependency bump once released — nothing 
 to prioritise here. Apologies for arriving cold with an alarmist framing.


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